I fly AS more often and if I'm in Y, they have a much better BOB product line with pre-order guaranteeing you can get what you want regardless of where you're sitting. On AA in F, I prefer their catering over AS because...
1. They have more "comfort" food options like the always reliable beef rib.
2. They still serve salads with meals unlike AS which frequently has been subbing it out for a glob of humus.
3. AA offers a choice of bread from a bread basket whereas you only have one bread option on AS.
4. Ice cream sundaes on longer transcons with AA whereas AS serves small cups of pre-packaged ice cream that typically includes "weird" flavors I would never choose on the ground.